#include "FGPiston.h"
#include "FGPropulsion.h"
+namespace JSBSim {
+
static const char *IdSrc = "$Id$";
static const char *IdHdr = ID_PISTON;
{
string token;
+ Type = etPiston;
+ crank_counter = 0;
+ EngineNumber = 0;
+ OilTemp_degK = 298;
MinManifoldPressure_inHg = 6.5;
MaxManifoldPressure_inHg = 28.5;
+ ManifoldPressure_inHg = Atmosphere->GetPressure() * psftoinhg; // psf to in Hg
+ CylinderHeadTemp_degK = 0.0;
Displacement = 360;
MaxHP = 200;
Cycles = 2;
IdleRPM = 600;
-
- Name = Eng_cfg->GetValue("NAME");
- Eng_cfg->GetNextConfigLine();
- while (Eng_cfg->GetValue() != string("/FG_PISTON")) {
- *Eng_cfg >> token;
- if (token == "MINMP") *Eng_cfg >> MinManifoldPressure_inHg;
- else if (token == "MAXMP") *Eng_cfg >> MaxManifoldPressure_inHg;
- else if (token == "DISPLACEMENT") *Eng_cfg >> Displacement;
- else if (token == "MAXHP") *Eng_cfg >> MaxHP;
- else if (token == "CYCLES") *Eng_cfg >> Cycles;
- else if (token == "IDLERPM") *Eng_cfg >> IdleRPM;
- else if (token == "MAXTHROTTLE") *Eng_cfg >> MaxThrottle;
- else if (token == "MINTHROTTLE") *Eng_cfg >> MinThrottle;
- else cerr << "Unhandled token in Engine config file: " << token << endl;
- }
-
- Type = etPiston;
- crank_counter = 0;
- EngineNumber = 0;
- OilTemp_degK = 298;
- ManifoldPressure_inHg = Atmosphere->GetPressure() * psftoinhg; // psf to in Hg
+ Magnetos = 0;
+ ExhaustGasTemp_degK = 0.0;
+ EGT_degC = 0.0;
dt = State->Getdt();
*Power_Mixture_Correlation << 20 << 74.0;
*Power_Mixture_Correlation << (14.7/0.6) << 58;
+ Name = Eng_cfg->GetValue("NAME");
+ Eng_cfg->GetNextConfigLine();
+ while (Eng_cfg->GetValue() != string("/FG_PISTON")) {
+ *Eng_cfg >> token;
+ if (token == "MINMP") *Eng_cfg >> MinManifoldPressure_inHg;
+ else if (token == "MAXMP") *Eng_cfg >> MaxManifoldPressure_inHg;
+ else if (token == "DISPLACEMENT") *Eng_cfg >> Displacement;
+ else if (token == "MAXHP") *Eng_cfg >> MaxHP;
+ else if (token == "CYCLES") *Eng_cfg >> Cycles;
+ else if (token == "IDLERPM") *Eng_cfg >> IdleRPM;
+ else if (token == "MAXTHROTTLE") *Eng_cfg >> MaxThrottle;
+ else if (token == "MINTHROTTLE") *Eng_cfg >> MinThrottle;
+ else cerr << "Unhandled token in Engine config file: " << token << endl;
+ }
+
Debug(0); // Call Debug() routine from constructor if needed
}
double FGPiston::Calculate(double PowerRequired)
{
- ConsumeFuel();
+ if (FuelFlow_gph > 0.0) ConsumeFuel();
Throttle = FCS->GetThrottlePos(EngineNumber);
Mixture = FCS->GetMixturePos(EngineNumber);
p_amb_sea_level = Atmosphere->GetPressureSL() * 48;
T_amb = Atmosphere->GetTemperature() * (5.0 / 9.0); // convert from Rankine to Kelvin
- RPM = Propulsion->GetThruster(EngineNumber)->GetRPM();
+ RPM = Propulsion->GetThruster(EngineNumber)->GetRPM() *
+ Propulsion->GetThruster(EngineNumber)->GetGearRatio();
IAS = Auxiliary->GetVcalibratedKTS();
void FGPiston::doEnginePower(void)
{
ManifoldPressure_inHg *= p_amb / p_amb_sea_level;
+
if (Running) {
double ManXRPM = ManifoldPressure_inHg * RPM;
- // FIXME: this needs to be generalized
+ double T_amb_degF = KelvinToFahrenheit(T_amb);
+ double T_amb_sea_lev_degF = KelvinToFahrenheit(288);
+
+ // FIXME: this needs to be generalized
Percentage_Power = (6e-9 * ManXRPM * ManXRPM) + (8e-4 * ManXRPM) - 1.0;
- double T_amb_degF = (T_amb * 1.8) - 459.67;
- double T_amb_sea_lev_degF = (288 * 1.8) - 459.67;
- Percentage_Power =
- Percentage_Power + ((T_amb_sea_lev_degF - T_amb_degF) * 7 /120);
+ Percentage_Power += ((T_amb_sea_lev_degF - T_amb_degF) * 7 /120);
+
double Percentage_of_best_power_mixture_power =
Power_Mixture_Correlation->GetValue(14.7 / equivalence_ratio);
- Percentage_Power =
- Percentage_Power * Percentage_of_best_power_mixture_power / 100.0;
- if (Percentage_Power < 0.0)
- Percentage_Power = 0.0;
- else if (Percentage_Power > 100.0)
- Percentage_Power = 100.0;
+
+ Percentage_Power *= Percentage_of_best_power_mixture_power / 100.0;
+
+ if (Percentage_Power < 0.0) Percentage_Power = 0.0;
+ else if (Percentage_Power > 100.0) Percentage_Power = 100.0;
+
HP = Percentage_Power * MaxHP / 100.0;
- } else {
+
+ } else {
+
// Power output when the engine is not running
if (Cranking) {
if (RPM < 10) {
- HP = 3.0; // This is a hack to prevent overshooting the idle rpm in the first time step
- // It may possibly need to be changed if the prop model is changed.
+ HP = 3.0; // This is a hack to prevent overshooting the idle rpm in
+ // the first time step. It may possibly need to be changed
+ // if the prop model is changed.
} else if (RPM < 480) {
HP = 3.0 + ((480 - RPM) / 10.0);
// This is a guess - would be nice to find a proper starter moter torque curve
{
return FuelFlow_gph / 3600 * 6 * State->Getdt() * Propulsion->GetRate();
}
+
+} // namespace JSBSim